A man from Long Island, New York, is facing up to 30 days in jail and a US$500 fine after a neighbour complained to police he was laughing too loudly, his lawyer said yesterday. More here

It is childish, bhikkhus, in the discipline of the noble ones to laugh excessively showing the teeth. Therefore, bhikkhus, having given up singing, having given up dancing, it is suitable for you who delight in the Dhamma to smile moderately mindful smiles. Ruṇṇa Sutta